Preheat oven at 180°C for 30 minutes.

Sift Flour and put aside.

Oil and dust baking tin/ sufuria with flour and put aside.

In a large bowl, mix margarine & sugar untill well mixed.

Add Eggs one by one to the batter while mixing.

Add half the flour and mix well then add milk.

Add the remaining flour followed by milk and lemon zest. Mix untill a smooth consistency is achieved.

Pour half the batter into baking tin. Add cocoa powder into the remaining batter and mix.

Add batter with cocoa powder into the baking tin. And use a spatula to stir gently into desired pattern.

Place in oven and bake for 30 mins at 220°C.